Suppress 2nd warning below which makes the test fail.

Suppress 2nd warning below which makes the test fail.

not ok 3 - Expected loader warning
#   Failed test 'Expected loader warning'
#   at t/lib/dbixcsl_common_tests.pm line 149.
#          got: '4'
#     expected: '3'
# DBIx::Class::Schema::Loader::connection(): loader_test9 has no primary key at (eval 57)[t/lib/dbixcsl_common_te
# Use of uninitialized value in string ne at lib/DBIx/Class/Schema/Loader/Base.pm line 454.
# Dumping manual schema for DBIXCSL_Test::Schema to directory ./t/_common_dump ...
# Schema dump completed.